I can't help but think that isn't it too much for high schoolers to do things like intensive kiss, licking some parts of the body, bitting (usually in some sensitive parts), do something in a bedroom like from some previous chapter, etc.
I don't know whether it's a customary there or it only happens in this manga. I also don't think this is your usual shoujo manga, the romance is indeed fluffy, but it's also rather dangerous than a mere fluffiness. Well, just my opinion here, maybe there are some people liking this kinda stuff, I don't blame anyone for this